HIGH ALTITUDE NEUTRON INTENSITY DIURNAL VARIATION
Technical Report
·
OSTI ID:4177151
Two balloon flights in which boron-trifluoride neutron counters were carried aloft were hunched during September, 1958. The nights attained altitudes of 86,000 and 79,000 feet, at a conventional geomagnetic latitude of 41 deg N. The data obtained reveal that the neutron intensities in the atmosphere decreased by about 12% since the time of minimum solar activity in 1954, and that this decrease was mainly in the low-energy end of the spectrum, as the mean free path for absorption had incrensed from 180 plus or minus 25 to 240 plus or minus 30 gm/cm/sup 2/. After achieving altitude, the balloons floated at a constant elevation through sunset. A sharp peak in the intensity which occurs just before sunset at balloon altitudes was detected on both flights, and appears to be genuine as it is considerably beyond the statistical errors. Several possible explanations for this effect are discussed. (auth) energy region (auth)
- Research Organization:
- New York Univ., New York. Coll. of Engineering
- NSA Number:
- NSA-14-012129
- OSTI ID:
- 4177151
- Report Number(s):
- NP-8528
- Country of Publication:
- United States
- Language:
- English
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